#Cairo canvas. The following variables are available:
# * CNTX: A reference to the current cairo context object
# * W: Canvas width
# * H: Canvas height
# Have fun!

i = 0
# ciclo
while i < W:
    # condicional. % es la operacion modulo
    if i % 10 == 0:
        CNTX.move_to( i, 0 )
        CNTX.line_to( i, H )
        CNTX.stroke()
        
    i += 1
